Universal serial bus controller with a direct memory access mode
US6266715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A universal serial bus (USB) device or host provides a universal serial bus (USB) controller with a direct memory access (DMA) mode. In a DMA mode, a universal serial bus (USB) transmit endpoint may be programmed for a direct memory access (DMA) transmit channel, or a universal serial bus (USB) receive endpoint may be programmed for a direct memory access (DMA) receive channel. For a USB device, a DMA transmit channel performs data transfer to a universal serial bus (USB) host, and a DMA receive channel handles data transfer from the USB host. For a USB host, a DMA transmit channel performs data transfer to the USB device, and a DMA receive channel handles data transfer from the USB device. A universal serial bus transmit protocol and a universal serial bus receive protocol for the DMA mode of the USB controller permit a maximum packet size of universal serial bus (USB) data to be programmed to a value greater than the physical size of a USB transmit or receive buffer of a USB transmit or receive endpoint. A USB controller with a DMA mode thus allows for a significant reduction in the buffer size of a USB transmit or receive buffer. A USB device having a controller with a DMA mode …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.